[6.1][regression] after commit dd80d9c8eecac8c516da5b240d01a35660ba6cb6 some games (Cyberpunk 2077, Forza Horizon 4/5) hang at start

[Christian König]

Am 22.11.22 um 00:42 schrieb Mikhail Gavrilov:
> On Mon, Nov 14, 2022 at 6:22 PM Christian König
> <christian.koenig at amd.com> wrote:
>> I've found and fixed a few problems around the userptr handling which
>> might explain what you see here.
>>
>> A series of four patches starting with "drm/amdgpu: always register an
>> MMU notifier for userptr" is under review now.
>>
>> Going to give that a bit cleanup later today and will CC you when I send
>> that out. Would be nice if you could give that some testing.
>>
>> Thanks,
>> Christian.
>>
> Christian, I tested all four patches around week and can say that this
> issue is completely gone.
> All known broken games working.
> Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov at gmail.com>

Ah, thanks a lot for this. I've already pushed the patches into our 
internal branch, but getting this confirmation is still great!

This was quite some fundamental bug in the handling and I hope to get 
this completely reworked at some point since it is currently only mitigated.

> The only thing I don't like is the flood in the kernel logs of the
> message "WARNING message at drivers/gpu/drm/drm_modeset_lock.c:276
> drm_modeset_drop_locks+0x63/0x70", but this is not related to the
> patches being checked.
> All kernel logs uploaded to pastebin [1][2][3][4][5][6][7][8]

No idea what that could be. Modesetting is not something I work on.

The best advice I can give you is to maybe ping Harry and our other 
display people, they should know that stuff better than I do.

Thanks,
Christian.

>
> I wrote a separate bug report about "drm_modeset_lock" [9], it's a
> pity that no one paid attention to it. I even found the first bad
> commit. It is b261509952bc19d1012cf732f853659be6ebc61e.
>
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> Thanks.
>